Dear colleagues, Our preprint 'The Recurrent Nova U Scorpii in the 1999 Outburst: the First Detection of a Significant Orbital-Period Change', which will appear in PASJ, Vol.55, No.1, is available on the preprint server: http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/U_Sco/usco1999.pdf http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/U_Sco/usco1999.ps.gz or http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/U_Sco/usco1999.pdf http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/U_Sco/usco1999.ps.gz Regards, -- Katsura Matsumoto (Okayama University, Japan) katsura@cc.okayama-u.ac.jp